Let's say you're dragging something at 3 cm/s. Rendered at 30 Hz, a one frame latency translates into 30/30 mm which is 1 mm. A 1mm gap between the cursor and t

Let's say you're dragging something at 3 cm/s. Rendered at 30 Hz, a one frame latency translates into 30/30 mm which is 1 mm. A 1mm gap between the cursor and the thing you're dragging is definitely perceptible, and this is for a relatively slow drag. It's at least enough to destroy the illusion that the thing is locked to your cursor.